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"A ball with a mass of 250 g has a centripetal acceleration of 5 m/s2. What is the centripetal force acting on this ball? "

Since radius depends on the string length I have no idea how to derive it from these 2 variables. The only formula I know for getting centripetal force isF = m * V^2 / r

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# Homework Help: Calculating centripetal force when radius is unknown

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